path: root/kernel
diff options
authorChristoph Hellwig <hch@lst.de>2016-08-11 07:06:45 -0700
committerThomas Gleixner <tglx@linutronix.de>2016-08-22 11:22:44 +0200
commit3ee0ce2a54dff07d09440723594df89bc1a12e79 (patch)
tree68a27c262c9f41cf768856730927e9d8467d111b /kernel
parent4396f46c8c628329bd35ee4b84140b8b001a11eb (diff)
genirq/affinity: Use get/put_online_cpus around cpumask operations
Without locking out CPU mask operations we might end up with an inconsistent view of the cpumask in the function. Fixes: 5e385a6ef31f: "genirq: Add a helper to spread an affinity mask for MSI/MSI-X vectors" Signed-off-by: Christoph Hellwig <hch@lst.de> Link: http://lkml.kernel.org/r/1470924405-25728-1-git-send-email-hch@lst.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index f68959341c0f..32f6cfcff212 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -39,6 +39,7 @@ struct cpumask *irq_create_affinity_mask(unsigned int *nr_vecs)
return NULL;
+ get_online_cpus();
if (max_vecs >= num_online_cpus()) {
cpumask_copy(affinity_mask, cpu_online_mask);
*nr_vecs = num_online_cpus();
@@ -56,6 +57,7 @@ struct cpumask *irq_create_affinity_mask(unsigned int *nr_vecs)
*nr_vecs = vecs;
+ put_online_cpus();
return affinity_mask;